function check_user(){
	if(isEmpty(document.getElementById("user_name_tx").value)){
		alert("the name can't be empty!");
		return false;
	}
	if(isEmpty(document.getElementById("user_pass_tx").value)){
		alert("the password can't be empty!");
		return false;
	}
	if(isEmpty(document.getElementById("user_quection_tx").value)){
		alert("look for an airtight problem can't be empty!");
		return false;
	}
	if(isEmpty(document.getElementById("user_answer_tx").value)){
		alert("the problem answer can't be empty!");
		return false;
	}
	if(isEmpty(document.getElementById("user_email_tx").value)){
		alert("the email can't be empty!");
		return false;
	}
	if(!emailCheck(document.getElementById("user_email_tx").value)){
		alert("email format inaccuracy!");
		return false;
	}
	return true;
}
function check_user_E(){
	if(isEmpty(document.getElementById("user_name_tx").value)){
		alert("the name can't be empty!");
		return false;
	}
	if(isEmpty(document.getElementById("user_quection_tx").value)){
		alert("look for an airtight problem can't be empty!");
		return false;
	}
	if(isEmpty(document.getElementById("user_email_tx").value)){
		alert("the email can't be empty!");
		return false;
	}
	if(!emailCheck(document.getElementById("user_email_tx").value)){
		alert("email format inaccuracy!");
		return false;
	}
	return true;
}

function check_cert(clid){
	clid+="_";
	if(isEmpty(document.getElementById(clid+"name_tx").value)){
		alert("the form of address can't be empty!");
		return false;
	}
	if(isEmpty(document.getElementById(clid+"content_tx").value)){
		alert("the contents can't be empty!");
		return false;
	}
	return true;
}

function check_msg(clid){
	clid+="_";
	if(isEmpty(document.getElementById(clid+"name_tx").value)){
		alert("the form of address can't be empty!");
		return false;
	}
	if(isEmpty(document.getElementById(clid+"content_tx").value)){
		alert("the contents can't be empty!");
		return false;
	}
	return true;
}

function check_shopadd(clid){
	clid+="_";
	if(isEmpty(document.getElementById(clid+"countadd_tx").value)){
		alert("the amount can't be empty!");
		return false;
	}
	if(isdigit(document.getElementById(clid+"countadd_tx").value)){
		alert("amount can be a numeral!");
		return false;
	}
	if(document.getElementById(clid+"countadd_tx").value>0){
		alert("the amount necessarily follows big with 1!");
		return false;
	}
	return true;
}
function check_shopedit(clid){
	clid+="_";
	if(isEmpty(document.getElementById(clid+"countadd_tx").value)){
		alert("the amount can't be empty!");
		return false;
	}
	if(isdigit(document.getElementById(clid+"countadd_tx").value)){
		alert("amount can be a numeral!");
		return false;
	}
	if(document.getElementById(clid+"countadd_tx").value>0){
		alert("the amount necessarily follows big with 1!");
		return false;
	}
	return true;
}
function check_shopsave(clid){
	clid+="_";
	if(isEmpty(document.getElementById(clid+"name_tx").value)){
		alert("the form of address can't be empty!");
		return false;
	}
	return true;
}

function check_job(clid){
	clid+="_";
	if(isEmpty(document.getElementById(clid+"name_tx").value)){
		alert("the name can't be empty!");
		return false;
	}
	return true;
}

function check_login(clid){
	clid+="_";
	if(isEmpty(document.getElementById(clid+"name_tx").value)){
		alert("the user's name can't be empty!");
		return false;
	}
	if(isEmpty(document.getElementById(clid+"pass_tx").value)){
		alert("the password can't be empty!");
		return false;
	}
	return true;
}

function check_forget1(clid){
	clid+="_";
	if(isEmpty(document.getElementById(clid+"name_tx").value)){
		alert("the user's name can't be empty!");
		return false;
	}
	return true;
}
function check_forget2(clid){
	clid+="_";
	if(isEmpty(document.getElementById(clid+"user_answer_tx").value)){
		alert("the problem answer can't be empty!");
		return false;
	}
	return true;
}
function check_forget3(clid){
	clid+="_";
	if(isEmpty(document.getElementById(clid+"user_pass_tx").value)){
		alert("the password can't be empty!");
		return false;
	}
	if(isEmpty(document.getElementById(clid+"confirm_pass_tx").value)){
		alert("confirm a password can't be empty!");
		return false;
	}
	if(document.getElementById(clid+"confirm_pass_tx").value!=document.getElementById(clid+"user_pass_tx").value){
		alert("password inconformity!");
		return false;
	}
	return true;
}

function check_editpaass(clid){
	clid+="_";
	if(isEmpty(document.getElementById(clid+"user_pass_tx").value)){
		alert("original password can't be empty!");
		return false;
	}
	if(isEmpty(document.getElementById(clid+"user_newpass_tx").value)){
		alert("new password can't be empty!");
		return false;
	}
	if(isEmpty(document.getElementById(clid+"confirm_pass_tx").value)){
		alert("confirm a new password can't be empty!");
		return false;
	}
	if(document.getElementById(clid+"user_newpass_tx").value!=document.getElementById(clid+"confirm_pass_tx").value){
		alert("password inconformity!");
		return false;
	}
	return true;
}

function check_useredit(clid){
	clid+="_";
	if(isEmpty(document.getElementById(clid+"user_email_tx").value)){
		alert("the mail can't be empty!");
		return false;
	}
	return true;
}

function check_reg(clid){
	clid+="_";
	if(isEmpty(document.getElementById(clid+"user_name_tx").value)){
		alert("the name can't be empty!");
		return false;
	}
	if(isEmpty(document.getElementById(clid+"user_pass_tx").value)){
		alert("the password can't be empty!");
		return false;
	}
	if(isEmpty(document.getElementById(clid+"confirm_pass_tx").value)){
		alert("confirm a password can't be empty!");
		return false;
	}
	if(document.getElementById(clid+"user_pass_tx").value!=document.getElementById(clid+"confirm_pass_tx").value){
		alert("password inconformity!");
		return false;
	}
	if(isEmpty(document.getElementById(clid+"user_quection_tx").value)){
		alert("look for an airtight problem can't be empty!");
		return false;
	}
	if(isEmpty(document.getElementById(clid+"user_answer_tx").value)){
		alert("the problem answer can't be empty!");
		return false;
	}
	if(isEmpty(document.getElementById(clid+"user_email_tx").value)){
		alert("the email can't be empty!");
		return false;
	}
	if(!emailCheck(document.getElementById(clid+"user_email_tx").value)){
		alert("email format inaccuracy!");
		return false;
	}
	return true;
}